Main Entry: dys·phe·mism Pronunciation GuidePronunciation: disfmizmFunction: nounInflected Form(s): -sEtymology: dys- + -phemism (as in euphemism): substitution of a disagreeable, offensive, or disparaging word or expression for an agreeable or inoffensive one (as of axle grease for butter, old man for father, or heap for car); also : a word or expression so substituted -- contrasted with euphemism

Another example:

"Ambulance chaser" for "personal injury attorney". Or do I have that backwards? Maybe "personal injury attorney" is a euphemism for "ambulance chaser".